Dissolution behavior of U $_{3}$ O $_{8}$ , FeUO $_{4}$ , and UO $_{2}$ -Zr-stainless steel system samples generated in an oxidative atmosphere in the presence of malonic acid

マロン酸存在酸化雰囲気下において生成したU $_{3}$ O $_{8}$ , FeUO $_{4}$ , and UO $_{2}$ -Zr-ステンレス系試料の溶解挙動

Tonna, Ryutaro*; Sasaki, Takayuki*; Okamoto, Yoshihiro; Kobayashi, Taishi*

The dissolution behavior of UO $_{2}$ -Zr-SS samples heated under oxidative conditions, along with the single uranium phases formed in the samples (U $_{3}$ O $_{8}$ and FeUO $_{4}$ ), was investigated through static leaching tests using malonic acid. Malonic acid promoted the dissolution of both U $_{3}$ O $_{8}$ and FeUO $_{4}$ solid phases owing to complex formation. The uranium concentrations of U $_{3}$ O $_{8}$ and FeUO $_{4}$ increased with malonic acid concentration and matched at steady state. In the absence of malonic acid, the U concentration of FeUO $_{4}$ was less than its solubility because of uranium adsorption on an iron hydrolysis solid phase. The uranium concentration after long immersion of the UO $_{2}$ -Zr-SS system samples could be explained by the behavior of U $_{3}$ O $_{8}$ and FeUO $_{4}$ . In the absence of malonic acid, U concentration decreased owing to adsorption onto the iron solid phase, similar to the behavior of FeUO $_{4}$ . In contrast, in the presence of malonic acid, U concentration was consistent with that observed for U $_{3}$ O $_{8}$ and FeUO $_{4}$ .

発表言語	:	English
掲載資料名	:	Journal of Nuclear Materials
巻	:	605
号	:
ページ数	:	p.155561_1 - 155561_9
発行年月	:	2025/02
発表会議名	:
開催年月	:
開催都市	:
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キーワード	:	XAFS; ウラン酸化物; 溶解挙動

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論文URL	:	https://doi.org/10.1016/j.jnucmat.2024.155561
研究データの公開先DOI	:	本成果にかかわる研究データのリンクです。
使用施設	:	SPring-8(大型放射光施設)
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登録番号 : AA20240622
抄録集掲載番号 : 53000481
論文投稿番号 : 29253

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Dissolution behavior of UO, FeUO, and UO-Zr-stainless steel system samples generated in an oxidative atmosphere in the presence of malonic acid

マロン酸存在酸化雰囲気下において生成したUO, FeUO, and UO-Zr-ステンレス系試料の溶解挙動

Dissolution behavior of U $_{3}$ O $_{8}$ , FeUO $_{4}$ , and UO $_{2}$ -Zr-stainless steel system samples generated in an oxidative atmosphere in the presence of malonic acid

マロン酸存在酸化雰囲気下において生成したU $_{3}$ O $_{8}$ , FeUO $_{4}$ , and UO $_{2}$ -Zr-ステンレス系試料の溶解挙動